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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-38108] ServerTransactionsMetrics should synchronize access to non-atomic members</title>
                <link>https://jira.mongodb.org/browse/SERVER-38108</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bc8bfc6b8ad5ebf05090ae49f8fa8bf35d028d28/src/mongo/db/server_transactions_metrics.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ServerTransactionsMetrics class&lt;/a&gt;&#160;is a service context decoration that maintains server-wide stats for transactions, including the opTimes of uncommitted/aborted transactions. The sets of opTimes are modified by TransactionParticipant through the TransactionMetricsObserver in several places (e.g. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bc8bfc6b8a/src/mongo/db/transaction_participant.cpp#L818-L820&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;onPrepare&lt;/a&gt;)&#160;and by the ReplicationCoordinator when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bc8bfc6b8a/src/mongo/db/repl/replication_coordinator_impl.cpp#L3168-L3169&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getting the stable timestamp&lt;/a&gt;. There is no internal synchronization for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bc8bfc6b8a/src/mongo/db/server_transactions_metrics.h#L182-L199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the lists of opTimes&lt;/a&gt;, so they can be concurrently modified, leading to data races.&lt;/p&gt;

&lt;p&gt;A simple fix would be to add a mutex to ServerTransactionsMetrics that protects these variables. The other member variables in the class are atomics, so they are already thread-safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="633187">SERVER-38108</key>
            <summary>ServerTransactionsMetrics should synchronize access to non-atomic members</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Nov 2018 15:44:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:36 +0000</updated>
                            <resolved>Thu, 29 Nov 2018 16:55:47 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2075579" author="xgen-internal-githook" created="Thu, 29 Nov 2018 16:54:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pavi Vetriselvan&apos;, &apos;email&apos;: &apos;pvselvan@umich.edu&apos;, &apos;username&apos;: &apos;pvselvan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38108&quot; title=&quot;ServerTransactionsMetrics should synchronize access to non-atomic members&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38108&quot;&gt;&lt;del&gt;SERVER-38108&lt;/del&gt;&lt;/a&gt; ServerTransactionMetrics should synchronize&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aabd9f0d30d089edc48befce977356d543880aba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aabd9f0d30d089edc48befce977356d543880aba&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2060889" author="judah.schvimer" created="Tue, 13 Nov 2018 22:49:40 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2060234" author="tess.avitabile" created="Tue, 13 Nov 2018 16:28:43 +0000"  >&lt;p&gt;The mutex acquisition under the replication coordinator mutex will go away when we stop pinning the stable timestamp, so I am not too worried about that one.&lt;/p&gt;</comment>
                            <comment id="2060214" author="schwerin" created="Tue, 13 Nov 2018 16:18:36 +0000"  >&lt;p&gt;I&apos;m nervous about adding mutex acquisitions underneath the replication coordinator mutex, because that mutex is the hottest in the system.&lt;/p&gt;</comment>
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